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Finding the Fourth Proportional to 975.11, 1,345.61 and 555.53

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Solution

The fourth proportional to 975.11, 1,345.61 and 555.53 is: 766.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.11 : 1,345.61 = 555.53 : x
  2. Step 2: Convert to fraction form
    975.11/1,345.61 = 555.53/x
  3. Step 3: Cross multiply
    975.11x = 1,345.61 × 555.53
  4. Step 4: Simplify right side
    975.11x = 747,521.38
  5. Step 5: Solve for x
    x = 747,521.38/975.11
  6. Step 6: Final answer
    x = 766.61

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Double scale
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1.5x scale

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.