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Finding the Fourth Proportional to 1,264.71, 1,745.63 and 1,140.15

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Solution

The fourth proportional to 1,264.71, 1,745.63 and 1,140.15 is: 1,573.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.71 : 1,745.63 = 1,140.15 : x
  2. Step 2: Convert to fraction form
    1,264.71/1,745.63 = 1,140.15/x
  3. Step 3: Cross multiply
    1,264.71x = 1,745.63 × 1,140.15
  4. Step 4: Simplify right side
    1,264.71x = 1,990,274.34
  5. Step 5: Solve for x
    x = 1,990,274.34/1,264.71
  6. Step 6: Final answer
    x = 1,573.70

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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.