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Finding the Fourth Proportional to 30,870.17, 42,600.87 and 18,120.87

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Solution

The fourth proportional to 30,870.17, 42,600.87 and 18,120.87 is: 25,006.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,870.17 : 42,600.87 = 18,120.87 : x
  2. Step 2: Convert to fraction form
    30,870.17/42,600.87 = 18,120.87/x
  3. Step 3: Cross multiply
    30,870.17x = 42,600.87 × 18,120.87
  4. Step 4: Simplify right side
    30,870.17x = 771,964,827.16
  5. Step 5: Solve for x
    x = 771,964,827.16/30,870.17
  6. Step 6: Final answer
    x = 25,006.83

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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.