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Finding the Fourth Proportional to 84,705.40, 127,058.10 and 81,206.20

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Solution

The fourth proportional to 84,705.40, 127,058.10 and 81,206.20 is: 121,809.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,705.40 : 127,058.10 = 81,206.20 : x
  2. Step 2: Convert to fraction form
    84,705.40/127,058.10 = 81,206.20/x
  3. Step 3: Cross multiply
    84,705.40x = 127,058.10 × 81,206.20
  4. Step 4: Simplify right side
    84,705.40x = 10,317,905,480.22
  5. Step 5: Solve for x
    x = 10,317,905,480.22/84,705.40
  6. Step 6: Final answer
    x = 121,809.30

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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.