Home / 99,547.15-149,320.45-81,979.87

Finding the Fourth Proportional to 99,547.15, 149,320.45 and 81,979.87

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Solution

The fourth proportional to 99,547.15, 149,320.45 and 81,979.87 is: 122,969.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,547.15 : 149,320.45 = 81,979.87 : x
  2. Step 2: Convert to fraction form
    99,547.15/149,320.45 = 81,979.87/x
  3. Step 3: Cross multiply
    99,547.15x = 149,320.45 × 81,979.87
  4. Step 4: Simplify right side
    99,547.15x = 12,241,271,079.34
  5. Step 5: Solve for x
    x = 12,241,271,079.34/99,547.15
  6. Step 6: Final answer
    x = 122,969.58

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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.