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Finding the Fourth Proportional to 975.18, 1,345.01 and 621.17

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Solution

The fourth proportional to 975.18, 1,345.01 and 621.17 is: 856.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.18 : 1,345.01 = 621.17 : x
  2. Step 2: Convert to fraction form
    975.18/1,345.01 = 621.17/x
  3. Step 3: Cross multiply
    975.18x = 1,345.01 × 621.17
  4. Step 4: Simplify right side
    975.18x = 835,470.03
  5. Step 5: Solve for x
    x = 835,470.03/975.18
  6. Step 6: Final answer
    x = 856.73

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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.