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Finding the Fourth Proportional to 1,275.40, 1,913.12 and 690.93

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Solution

The fourth proportional to 1,275.40, 1,913.12 and 690.93 is: 1,036.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.40 : 1,913.12 = 690.93 : x
  2. Step 2: Convert to fraction form
    1,275.40/1,913.12 = 690.93/x
  3. Step 3: Cross multiply
    1,275.40x = 1,913.12 × 690.93
  4. Step 4: Simplify right side
    1,275.40x = 1,321,831.14
  5. Step 5: Solve for x
    x = 1,321,831.14/1,275.40
  6. Step 6: Final answer
    x = 1,036.41

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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.