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Finding the Fourth Proportional to 10,085.60, 15,128.40 and 9,010.40

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Solution

The fourth proportional to 10,085.60, 15,128.40 and 9,010.40 is: 13,515.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,085.60 : 15,128.40 = 9,010.40 : x
  2. Step 2: Convert to fraction form
    10,085.60/15,128.40 = 9,010.40/x
  3. Step 3: Cross multiply
    10,085.60x = 15,128.40 × 9,010.40
  4. Step 4: Simplify right side
    10,085.60x = 136,312,935.36
  5. Step 5: Solve for x
    x = 136,312,935.36/10,085.60
  6. Step 6: Final answer
    x = 13,515.60

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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.