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Finding the Fourth Proportional to 78,718.60, 118,077.90 and 19,553.80

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Solution

The fourth proportional to 78,718.60, 118,077.90 and 19,553.80 is: 29,330.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,718.60 : 118,077.90 = 19,553.80 : x
  2. Step 2: Convert to fraction form
    78,718.60/118,077.90 = 19,553.80/x
  3. Step 3: Cross multiply
    78,718.60x = 118,077.90 × 19,553.80
  4. Step 4: Simplify right side
    78,718.60x = 2,308,871,641.02
  5. Step 5: Solve for x
    x = 2,308,871,641.02/78,718.60
  6. Step 6: Final answer
    x = 29,330.70

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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.