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Finding the Fourth Proportional to 687,985.60, 1,031,978.40 and 660,429.40

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Solution

The fourth proportional to 687,985.60, 1,031,978.40 and 660,429.40 is: 990,644.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,985.60 : 1,031,978.40 = 660,429.40 : x
  2. Step 2: Convert to fraction form
    687,985.60/1,031,978.40 = 660,429.40/x
  3. Step 3: Cross multiply
    687,985.60x = 1,031,978.40 × 660,429.40
  4. Step 4: Simplify right side
    687,985.60x = 681,548,875,524.96
  5. Step 5: Solve for x
    x = 681,548,875,524.96/687,985.60
  6. Step 6: Final answer
    x = 990,644.10

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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.