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Finding the Fourth Proportional to 28,178.52, 38,886.39 and 15,603

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Solution

The fourth proportional to 28,178.52, 38,886.39 and 15,603 is: 21,532.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,178.52 : 38,886.39 = 15,603 : x
  2. Step 2: Convert to fraction form
    28,178.52/38,886.39 = 15,603/x
  3. Step 3: Cross multiply
    28,178.52x = 38,886.39 × 15,603
  4. Step 4: Simplify right side
    28,178.52x = 606,744,343.17
  5. Step 5: Solve for x
    x = 606,744,343.17/28,178.52
  6. Step 6: Final answer
    x = 21,532.16

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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.