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Finding the Fourth Proportional to 1,047.61, 1,570.39 and 431.74

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Solution

The fourth proportional to 1,047.61, 1,570.39 and 431.74 is: 647.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.61 : 1,570.39 = 431.74 : x
  2. Step 2: Convert to fraction form
    1,047.61/1,570.39 = 431.74/x
  3. Step 3: Cross multiply
    1,047.61x = 1,570.39 × 431.74
  4. Step 4: Simplify right side
    1,047.61x = 678,003.27
  5. Step 5: Solve for x
    x = 678,003.27/1,047.61
  6. Step 6: Final answer
    x = 647.19

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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.