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Finding the Fourth Proportional to 1,988.16, 2,981.80 and 877.91

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Solution

The fourth proportional to 1,988.16, 2,981.80 and 877.91 is: 1,316.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.16 : 2,981.80 = 877.91 : x
  2. Step 2: Convert to fraction form
    1,988.16/2,981.80 = 877.91/x
  3. Step 3: Cross multiply
    1,988.16x = 2,981.80 × 877.91
  4. Step 4: Simplify right side
    1,988.16x = 2,617,734.93
  5. Step 5: Solve for x
    x = 2,617,734.93/1,988.16
  6. Step 6: Final answer
    x = 1,316.66

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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.