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Finding the Fourth Proportional to 991,487.88, 1,486,966.14 and 430,389

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Solution

The fourth proportional to 991,487.88, 1,486,966.14 and 430,389 is: 645,468.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,487.88 : 1,486,966.14 = 430,389 : x
  2. Step 2: Convert to fraction form
    991,487.88/1,486,966.14 = 430,389/x
  3. Step 3: Cross multiply
    991,487.88x = 1,486,966.14 × 430,389
  4. Step 4: Simplify right side
    991,487.88x = 639,973,870,028.46
  5. Step 5: Solve for x
    x = 639,973,870,028.46/991,487.88
  6. Step 6: Final answer
    x = 645,468.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.