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Finding the Fourth Proportional to 28,101.30, 42,139.80 and 14,055.90

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Solution

The fourth proportional to 28,101.30, 42,139.80 and 14,055.90 is: 21,077.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,101.30 : 42,139.80 = 14,055.90 : x
  2. Step 2: Convert to fraction form
    28,101.30/42,139.80 = 14,055.90/x
  3. Step 3: Cross multiply
    28,101.30x = 42,139.80 × 14,055.90
  4. Step 4: Simplify right side
    28,101.30x = 592,312,814.82
  5. Step 5: Solve for x
    x = 592,312,814.82/28,101.30
  6. Step 6: Final answer
    x = 21,077.77

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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.