Home / 1,287.18-1,931.00-409.77

Finding the Fourth Proportional to 1,287.18, 1,931.00 and 409.77

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Solution

The fourth proportional to 1,287.18, 1,931.00 and 409.77 is: 614.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.18 : 1,931.00 = 409.77 : x
  2. Step 2: Convert to fraction form
    1,287.18/1,931.00 = 409.77/x
  3. Step 3: Cross multiply
    1,287.18x = 1,931.00 × 409.77
  4. Step 4: Simplify right side
    1,287.18x = 791,263.82
  5. Step 5: Solve for x
    x = 791,263.82/1,287.18
  6. Step 6: Final answer
    x = 614.73

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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.