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Finding the Fourth Proportional to 72,275.68, 99,751.20 and 42,078.88

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Solution

The fourth proportional to 72,275.68, 99,751.20 and 42,078.88 is: 58,075.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,275.68 : 99,751.20 = 42,078.88 : x
  2. Step 2: Convert to fraction form
    72,275.68/99,751.20 = 42,078.88/x
  3. Step 3: Cross multiply
    72,275.68x = 99,751.20 × 42,078.88
  4. Step 4: Simplify right side
    72,275.68x = 4,197,418,774.66
  5. Step 5: Solve for x
    x = 4,197,418,774.66/72,275.68
  6. Step 6: Final answer
    x = 58,075.12

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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.