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Finding the Fourth Proportional to 78,603.60, 117,831.28 and 39,123.39

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Solution

The fourth proportional to 78,603.60, 117,831.28 and 39,123.39 is: 58,648.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,603.60 : 117,831.28 = 39,123.39 : x
  2. Step 2: Convert to fraction form
    78,603.60/117,831.28 = 39,123.39/x
  3. Step 3: Cross multiply
    78,603.60x = 117,831.28 × 39,123.39
  4. Step 4: Simplify right side
    78,603.60x = 4,609,959,121.64
  5. Step 5: Solve for x
    x = 4,609,959,121.64/78,603.60
  6. Step 6: Final answer
    x = 58,648.19

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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.