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Finding the Fourth Proportional to 28,115.79, 42,159.78 and 9,389.40

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Solution

The fourth proportional to 28,115.79, 42,159.78 and 9,389.40 is: 14,079.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,115.79 : 42,159.78 = 9,389.40 : x
  2. Step 2: Convert to fraction form
    28,115.79/42,159.78 = 9,389.40/x
  3. Step 3: Cross multiply
    28,115.79x = 42,159.78 × 9,389.40
  4. Step 4: Simplify right side
    28,115.79x = 395,855,038.33
  5. Step 5: Solve for x
    x = 395,855,038.33/28,115.79
  6. Step 6: Final answer
    x = 14,079.46

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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.