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Finding the Fourth Proportional to 659,780.10, 989,670.15 and 578,423.70

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Solution

The fourth proportional to 659,780.10, 989,670.15 and 578,423.70 is: 867,635.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,780.10 : 989,670.15 = 578,423.70 : x
  2. Step 2: Convert to fraction form
    659,780.10/989,670.15 = 578,423.70/x
  3. Step 3: Cross multiply
    659,780.10x = 989,670.15 × 578,423.70
  4. Step 4: Simplify right side
    659,780.10x = 572,448,669,942.56
  5. Step 5: Solve for x
    x = 572,448,669,942.56/659,780.10
  6. Step 6: Final answer
    x = 867,635.55

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Similar ratio
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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.