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Finding the Fourth Proportional to 72,686.34, 109,008.45 and 28,303.20

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Solution

The fourth proportional to 72,686.34, 109,008.45 and 28,303.20 is: 42,446.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,686.34 : 109,008.45 = 28,303.20 : x
  2. Step 2: Convert to fraction form
    72,686.34/109,008.45 = 28,303.20/x
  3. Step 3: Cross multiply
    72,686.34x = 109,008.45 × 28,303.20
  4. Step 4: Simplify right side
    72,686.34x = 3,085,287,962.04
  5. Step 5: Solve for x
    x = 3,085,287,962.04/72,686.34
  6. Step 6: Final answer
    x = 42,446.60

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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.