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Finding the Fourth Proportional to 72,428.40, 99,943.80 and 40,590.60

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Solution

The fourth proportional to 72,428.40, 99,943.80 and 40,590.60 is: 56,010.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,428.40 : 99,943.80 = 40,590.60 : x
  2. Step 2: Convert to fraction form
    72,428.40/99,943.80 = 40,590.60/x
  3. Step 3: Cross multiply
    72,428.40x = 99,943.80 × 40,590.60
  4. Step 4: Simplify right side
    72,428.40x = 4,056,778,808.28
  5. Step 5: Solve for x
    x = 4,056,778,808.28/72,428.40
  6. Step 6: Final answer
    x = 56,010.89

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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.