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Finding the Fourth Proportional to 974.74, 1,345.20 and 581.98

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Solution

The fourth proportional to 974.74, 1,345.20 and 581.98 is: 803.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.74 : 1,345.20 = 581.98 : x
  2. Step 2: Convert to fraction form
    974.74/1,345.20 = 581.98/x
  3. Step 3: Cross multiply
    974.74x = 1,345.20 × 581.98
  4. Step 4: Simplify right side
    974.74x = 782,879.50
  5. Step 5: Solve for x
    x = 782,879.50/974.74
  6. Step 6: Final answer
    x = 803.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.