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Finding the Fourth Proportional to 18,312.70, 25,271.56 and 9,929.20

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Solution

The fourth proportional to 18,312.70, 25,271.56 and 9,929.20 is: 13,702.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,312.70 : 25,271.56 = 9,929.20 : x
  2. Step 2: Convert to fraction form
    18,312.70/25,271.56 = 9,929.20/x
  3. Step 3: Cross multiply
    18,312.70x = 25,271.56 × 9,929.20
  4. Step 4: Simplify right side
    18,312.70x = 250,926,373.55
  5. Step 5: Solve for x
    x = 250,926,373.55/18,312.70
  6. Step 6: Final answer
    x = 13,702.31

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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.