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Finding the Fourth Proportional to 745.19, 1,117.75 and 258.28

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Solution

The fourth proportional to 745.19, 1,117.75 and 258.28 is: 387.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.19 : 1,117.75 = 258.28 : x
  2. Step 2: Convert to fraction form
    745.19/1,117.75 = 258.28/x
  3. Step 3: Cross multiply
    745.19x = 1,117.75 × 258.28
  4. Step 4: Simplify right side
    745.19x = 288,689.51
  5. Step 5: Solve for x
    x = 288,689.51/745.19
  6. Step 6: Final answer
    x = 387.40

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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.