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Finding the Fourth Proportional to 85,678.78, 118,240.40 and 47,438.32

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Solution

The fourth proportional to 85,678.78, 118,240.40 and 47,438.32 is: 65,466.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,678.78 : 118,240.40 = 47,438.32 : x
  2. Step 2: Convert to fraction form
    85,678.78/118,240.40 = 47,438.32/x
  3. Step 3: Cross multiply
    85,678.78x = 118,240.40 × 47,438.32
  4. Step 4: Simplify right side
    85,678.78x = 5,609,125,932.13
  5. Step 5: Solve for x
    x = 5,609,125,932.13/85,678.78
  6. Step 6: Final answer
    x = 65,466.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.