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Finding the Fourth Proportional to 985,125.85, 1,359,420.89 and 555,378.30

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Solution

The fourth proportional to 985,125.85, 1,359,420.89 and 555,378.30 is: 766,392.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    985,125.85 : 1,359,420.89 = 555,378.30 : x
  2. Step 2: Convert to fraction form
    985,125.85/1,359,420.89 = 555,378.30/x
  3. Step 3: Cross multiply
    985,125.85x = 1,359,420.89 × 555,378.30
  4. Step 4: Simplify right side
    985,125.85x = 754,992,860,095.80
  5. Step 5: Solve for x
    x = 754,992,860,095.80/985,125.85
  6. Step 6: Final answer
    x = 766,392.30

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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.