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Finding the Fourth Proportional to 78,837.70, 118,256.55 and 64,840.90

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Solution

The fourth proportional to 78,837.70, 118,256.55 and 64,840.90 is: 97,261.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,837.70 : 118,256.55 = 64,840.90 : x
  2. Step 2: Convert to fraction form
    78,837.70/118,256.55 = 64,840.90/x
  3. Step 3: Cross multiply
    78,837.70x = 118,256.55 × 64,840.90
  4. Step 4: Simplify right side
    78,837.70x = 7,667,861,132.90
  5. Step 5: Solve for x
    x = 7,667,861,132.90/78,837.70
  6. Step 6: Final answer
    x = 97,261.35

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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.