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Finding the Fourth Proportional to 666,421.88, 918,705.65 and 475,103.12

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Solution

The fourth proportional to 666,421.88, 918,705.65 and 475,103.12 is: 654,960.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,421.88 : 918,705.65 = 475,103.12 : x
  2. Step 2: Convert to fraction form
    666,421.88/918,705.65 = 475,103.12/x
  3. Step 3: Cross multiply
    666,421.88x = 918,705.65 × 475,103.12
  4. Step 4: Simplify right side
    666,421.88x = 436,479,913,707.58
  5. Step 5: Solve for x
    x = 436,479,913,707.58/666,421.88
  6. Step 6: Final answer
    x = 654,960.36

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Double scale
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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.