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Finding the Fourth Proportional to 84,905.40, 127,358.10 and 77,647.80

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Solution

The fourth proportional to 84,905.40, 127,358.10 and 77,647.80 is: 116,471.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,905.40 : 127,358.10 = 77,647.80 : x
  2. Step 2: Convert to fraction form
    84,905.40/127,358.10 = 77,647.80/x
  3. Step 3: Cross multiply
    84,905.40x = 127,358.10 × 77,647.80
  4. Step 4: Simplify right side
    84,905.40x = 9,889,076,277.18
  5. Step 5: Solve for x
    x = 9,889,076,277.18/84,905.40
  6. Step 6: Final answer
    x = 116,471.70

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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.