Home / 78,299.81-117,345.02-40,781.12

Finding the Fourth Proportional to 78,299.81, 117,345.02 and 40,781.12

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Solution

The fourth proportional to 78,299.81, 117,345.02 and 40,781.12 is: 61,117.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,299.81 : 117,345.02 = 40,781.12 : x
  2. Step 2: Convert to fraction form
    78,299.81/117,345.02 = 40,781.12/x
  3. Step 3: Cross multiply
    78,299.81x = 117,345.02 × 40,781.12
  4. Step 4: Simplify right side
    78,299.81x = 4,785,460,551.39
  5. Step 5: Solve for x
    x = 4,785,460,551.39/78,299.81
  6. Step 6: Final answer
    x = 61,117.15

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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.