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Finding the Fourth Proportional to 662,056.15, 991,830.78 and 391,373.90

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Solution

The fourth proportional to 662,056.15, 991,830.78 and 391,373.90 is: 586,319.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    662,056.15 : 991,830.78 = 391,373.90 : x
  2. Step 2: Convert to fraction form
    662,056.15/991,830.78 = 391,373.90/x
  3. Step 3: Cross multiply
    662,056.15x = 991,830.78 × 391,373.90
  4. Step 4: Simplify right side
    662,056.15x = 388,176,675,549.49
  5. Step 5: Solve for x
    x = 388,176,675,549.49/662,056.15
  6. Step 6: Final answer
    x = 586,319.87

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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.