Home / 1,439.16-1,985.13-915.54

Finding the Fourth Proportional to 1,439.16, 1,985.13 and 915.54

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Solution

The fourth proportional to 1,439.16, 1,985.13 and 915.54 is: 1,262.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.16 : 1,985.13 = 915.54 : x
  2. Step 2: Convert to fraction form
    1,439.16/1,985.13 = 915.54/x
  3. Step 3: Cross multiply
    1,439.16x = 1,985.13 × 915.54
  4. Step 4: Simplify right side
    1,439.16x = 1,817,465.92
  5. Step 5: Solve for x
    x = 1,817,465.92/1,439.16
  6. Step 6: Final answer
    x = 1,262.87

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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.