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Finding the Fourth Proportional to 1,004.89, 1,507.80 and 988.49

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Solution

The fourth proportional to 1,004.89, 1,507.80 and 988.49 is: 1,483.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.89 : 1,507.80 = 988.49 : x
  2. Step 2: Convert to fraction form
    1,004.89/1,507.80 = 988.49/x
  3. Step 3: Cross multiply
    1,004.89x = 1,507.80 × 988.49
  4. Step 4: Simplify right side
    1,004.89x = 1,490,445.22
  5. Step 5: Solve for x
    x = 1,490,445.22/1,004.89
  6. Step 6: Final answer
    x = 1,483.19

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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.