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Finding the Fourth Proportional to 1,047.10, 1,570.11 and 661.54

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Solution

The fourth proportional to 1,047.10, 1,570.11 and 661.54 is: 991.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.10 : 1,570.11 = 661.54 : x
  2. Step 2: Convert to fraction form
    1,047.10/1,570.11 = 661.54/x
  3. Step 3: Cross multiply
    1,047.10x = 1,570.11 × 661.54
  4. Step 4: Simplify right side
    1,047.10x = 1,038,690.57
  5. Step 5: Solve for x
    x = 1,038,690.57/1,047.10
  6. Step 6: Final answer
    x = 991.97

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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.