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Finding the Fourth Proportional to 745.24, 1,111.28 and 643.18

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Solution

The fourth proportional to 745.24, 1,111.28 and 643.18 is: 959.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.24 : 1,111.28 = 643.18 : x
  2. Step 2: Convert to fraction form
    745.24/1,111.28 = 643.18/x
  3. Step 3: Cross multiply
    745.24x = 1,111.28 × 643.18
  4. Step 4: Simplify right side
    745.24x = 714,753.07
  5. Step 5: Solve for x
    x = 714,753.07/745.24
  6. Step 6: Final answer
    x = 959.09

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.