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Finding the Fourth Proportional to 98,776.65, 136,312.64 and 57,965.21

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Solution

The fourth proportional to 98,776.65, 136,312.64 and 57,965.21 is: 79,992.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,776.65 : 136,312.64 = 57,965.21 : x
  2. Step 2: Convert to fraction form
    98,776.65/136,312.64 = 57,965.21/x
  3. Step 3: Cross multiply
    98,776.65x = 136,312.64 × 57,965.21
  4. Step 4: Simplify right side
    98,776.65x = 7,901,390,560.41
  5. Step 5: Solve for x
    x = 7,901,390,560.41/98,776.65
  6. Step 6: Final answer
    x = 79,992.49

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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.