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Finding the Fourth Proportional to 66,878.79, 99,728.74 and 66,279.21

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Solution

The fourth proportional to 66,878.79, 99,728.74 and 66,279.21 is: 98,834.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,878.79 : 99,728.74 = 66,279.21 : x
  2. Step 2: Convert to fraction form
    66,878.79/99,728.74 = 66,279.21/x
  3. Step 3: Cross multiply
    66,878.79x = 99,728.74 × 66,279.21
  4. Step 4: Simplify right side
    66,878.79x = 6,609,942,101.50
  5. Step 5: Solve for x
    x = 6,609,942,101.50/66,878.79
  6. Step 6: Final answer
    x = 98,834.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.