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Finding the Fourth Proportional to 85,612.80, 118,258.54 and 65,715.54

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Solution

The fourth proportional to 85,612.80, 118,258.54 and 65,715.54 is: 90,774.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,612.80 : 118,258.54 = 65,715.54 : x
  2. Step 2: Convert to fraction form
    85,612.80/118,258.54 = 65,715.54/x
  3. Step 3: Cross multiply
    85,612.80x = 118,258.54 × 65,715.54
  4. Step 4: Simplify right side
    85,612.80x = 7,771,423,815.71
  5. Step 5: Solve for x
    x = 7,771,423,815.71/85,612.80
  6. Step 6: Final answer
    x = 90,774.09

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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.