Home / 1,387.76-1,916.40-1,037.84

Finding the Fourth Proportional to 1,387.76, 1,916.40 and 1,037.84

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Solution

The fourth proportional to 1,387.76, 1,916.40 and 1,037.84 is: 1,433.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.76 : 1,916.40 = 1,037.84 : x
  2. Step 2: Convert to fraction form
    1,387.76/1,916.40 = 1,037.84/x
  3. Step 3: Cross multiply
    1,387.76x = 1,916.40 × 1,037.84
  4. Step 4: Simplify right side
    1,387.76x = 1,988,916.58
  5. Step 5: Solve for x
    x = 1,988,916.58/1,387.76
  6. Step 6: Final answer
    x = 1,433.18

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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.