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Finding the Fourth Proportional to 100,770.54, 139,005.60 and 62,979.18

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Solution

The fourth proportional to 100,770.54, 139,005.60 and 62,979.18 is: 86,875.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,770.54 : 139,005.60 = 62,979.18 : x
  2. Step 2: Convert to fraction form
    100,770.54/139,005.60 = 62,979.18/x
  3. Step 3: Cross multiply
    100,770.54x = 139,005.60 × 62,979.18
  4. Step 4: Simplify right side
    100,770.54x = 8,754,458,703.41
  5. Step 5: Solve for x
    x = 8,754,458,703.41/100,770.54
  6. Step 6: Final answer
    x = 86,875.18

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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.