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Finding the Fourth Proportional to 717,416.90, 990,041.64 and 395,138.16

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Solution

The fourth proportional to 717,416.90, 990,041.64 and 395,138.16 is: 545,294.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,416.90 : 990,041.64 = 395,138.16 : x
  2. Step 2: Convert to fraction form
    717,416.90/990,041.64 = 395,138.16/x
  3. Step 3: Cross multiply
    717,416.90x = 990,041.64 × 395,138.16
  4. Step 4: Simplify right side
    717,416.90x = 391,203,231,952.98
  5. Step 5: Solve for x
    x = 391,203,231,952.98/717,416.90
  6. Step 6: Final answer
    x = 545,294.14

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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.