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Finding the Fourth Proportional to 10,657.20, 15,985.80 and 8,810.40

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Solution

The fourth proportional to 10,657.20, 15,985.80 and 8,810.40 is: 13,215.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,657.20 : 15,985.80 = 8,810.40 : x
  2. Step 2: Convert to fraction form
    10,657.20/15,985.80 = 8,810.40/x
  3. Step 3: Cross multiply
    10,657.20x = 15,985.80 × 8,810.40
  4. Step 4: Simplify right side
    10,657.20x = 140,841,292.32
  5. Step 5: Solve for x
    x = 140,841,292.32/10,657.20
  6. Step 6: Final answer
    x = 13,215.60

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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.