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Finding the Fourth Proportional to 687,712.80, 1,031,860.80 and 435,187.20

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Solution

The fourth proportional to 687,712.80, 1,031,860.80 and 435,187.20 is: 652,965.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,712.80 : 1,031,860.80 = 435,187.20 : x
  2. Step 2: Convert to fraction form
    687,712.80/1,031,860.80 = 435,187.20/x
  3. Step 3: Cross multiply
    687,712.80x = 1,031,860.80 × 435,187.20
  4. Step 4: Simplify right side
    687,712.80x = 449,052,612,341.76
  5. Step 5: Solve for x
    x = 449,052,612,341.76/687,712.80
  6. Step 6: Final answer
    x = 652,965.33

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1.5x scale

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.