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Finding the Fourth Proportional to 91,078.70, 135,702.32 and 85,985.72

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Solution

The fourth proportional to 91,078.70, 135,702.32 and 85,985.72 is: 128,114.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,078.70 : 135,702.32 = 85,985.72 : x
  2. Step 2: Convert to fraction form
    91,078.70/135,702.32 = 85,985.72/x
  3. Step 3: Cross multiply
    91,078.70x = 135,702.32 × 85,985.72
  4. Step 4: Simplify right side
    91,078.70x = 11,668,461,574.98
  5. Step 5: Solve for x
    x = 11,668,461,574.98/91,078.70
  6. Step 6: Final answer
    x = 128,114.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.