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Finding the Fourth Proportional to 10,508.80, 15,730.80 and 9,342.40

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Solution

The fourth proportional to 10,508.80, 15,730.80 and 9,342.40 is: 13,984.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,508.80 : 15,730.80 = 9,342.40 : x
  2. Step 2: Convert to fraction form
    10,508.80/15,730.80 = 9,342.40/x
  3. Step 3: Cross multiply
    10,508.80x = 15,730.80 × 9,342.40
  4. Step 4: Simplify right side
    10,508.80x = 146,963,425.92
  5. Step 5: Solve for x
    x = 146,963,425.92/10,508.80
  6. Step 6: Final answer
    x = 13,984.80

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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.