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Finding the Fourth Proportional to 1,242.76, 1,715.16 and 745.68

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Solution

The fourth proportional to 1,242.76, 1,715.16 and 745.68 is: 1,029.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.76 : 1,715.16 = 745.68 : x
  2. Step 2: Convert to fraction form
    1,242.76/1,715.16 = 745.68/x
  3. Step 3: Cross multiply
    1,242.76x = 1,715.16 × 745.68
  4. Step 4: Simplify right side
    1,242.76x = 1,278,960.51
  5. Step 5: Solve for x
    x = 1,278,960.51/1,242.76
  6. Step 6: Final answer
    x = 1,029.13

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Find fourth proportional to 621.38, 857.58 and 372.84
Half scale
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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.