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Finding the Fourth Proportional to 717,666.32, 990,424.20 and 395,376.32

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Solution

The fourth proportional to 717,666.32, 990,424.20 and 395,376.32 is: 545,643.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,666.32 : 990,424.20 = 395,376.32 : x
  2. Step 2: Convert to fraction form
    717,666.32/990,424.20 = 395,376.32/x
  3. Step 3: Cross multiply
    717,666.32x = 990,424.20 × 395,376.32
  4. Step 4: Simplify right side
    717,666.32x = 391,590,270,482.82
  5. Step 5: Solve for x
    x = 391,590,270,482.82/717,666.32
  6. Step 6: Final answer
    x = 545,643.93

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.