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Finding the Fourth Proportional to 712,290.62, 982,960.88 and 390,000.62

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Solution

The fourth proportional to 712,290.62, 982,960.88 and 390,000.62 is: 538,200.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,290.62 : 982,960.88 = 390,000.62 : x
  2. Step 2: Convert to fraction form
    712,290.62/982,960.88 = 390,000.62/x
  3. Step 3: Cross multiply
    712,290.62x = 982,960.88 × 390,000.62
  4. Step 4: Simplify right side
    712,290.62x = 383,355,352,635.75
  5. Step 5: Solve for x
    x = 383,355,352,635.75/712,290.62
  6. Step 6: Final answer
    x = 538,200.76

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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.