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Finding the Fourth Proportional to 72,345.39, 99,834.31 and 40,078.68

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Solution

The fourth proportional to 72,345.39, 99,834.31 and 40,078.68 is: 55,307.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,345.39 : 99,834.31 = 40,078.68 : x
  2. Step 2: Convert to fraction form
    72,345.39/99,834.31 = 40,078.68/x
  3. Step 3: Cross multiply
    72,345.39x = 99,834.31 × 40,078.68
  4. Step 4: Simplify right side
    72,345.39x = 4,001,226,663.95
  5. Step 5: Solve for x
    x = 4,001,226,663.95/72,345.39
  6. Step 6: Final answer
    x = 55,307.28

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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.