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Finding the Fourth Proportional to 1,988.16, 2,980.29 and 947.88

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Solution

The fourth proportional to 1,988.16, 2,980.29 and 947.88 is: 1,420.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.16 : 2,980.29 = 947.88 : x
  2. Step 2: Convert to fraction form
    1,988.16/2,980.29 = 947.88/x
  3. Step 3: Cross multiply
    1,988.16x = 2,980.29 × 947.88
  4. Step 4: Simplify right side
    1,988.16x = 2,824,957.29
  5. Step 5: Solve for x
    x = 2,824,957.29/1,988.16
  6. Step 6: Final answer
    x = 1,420.89

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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.