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Finding the Fourth Proportional to 78,877.60, 118,186.80 and 65,658.40

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Solution

The fourth proportional to 78,877.60, 118,186.80 and 65,658.40 is: 98,379.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,877.60 : 118,186.80 = 65,658.40 : x
  2. Step 2: Convert to fraction form
    78,877.60/118,186.80 = 65,658.40/x
  3. Step 3: Cross multiply
    78,877.60x = 118,186.80 × 65,658.40
  4. Step 4: Simplify right side
    78,877.60x = 7,759,956,189.12
  5. Step 5: Solve for x
    x = 7,759,956,189.12/78,877.60
  6. Step 6: Final answer
    x = 98,379.72

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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.