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Finding the Fourth Proportional to 98,889, 136,475.70 and 56,461.20

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Solution

The fourth proportional to 98,889, 136,475.70 and 56,461.20 is: 77,921.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,889 : 136,475.70 = 56,461.20 : x
  2. Step 2: Convert to fraction form
    98,889/136,475.70 = 56,461.20/x
  3. Step 3: Cross multiply
    98,889x = 136,475.70 × 56,461.20
  4. Step 4: Simplify right side
    98,889x = 7,705,581,792.84
  5. Step 5: Solve for x
    x = 7,705,581,792.84/98,889
  6. Step 6: Final answer
    x = 77,921.53

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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.