Home / 1,389.24-1,916.46-1,237.76

Finding the Fourth Proportional to 1,389.24, 1,916.46 and 1,237.76

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Solution

The fourth proportional to 1,389.24, 1,916.46 and 1,237.76 is: 1,707.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.24 : 1,916.46 = 1,237.76 : x
  2. Step 2: Convert to fraction form
    1,389.24/1,916.46 = 1,237.76/x
  3. Step 3: Cross multiply
    1,389.24x = 1,916.46 × 1,237.76
  4. Step 4: Simplify right side
    1,389.24x = 2,372,117.53
  5. Step 5: Solve for x
    x = 2,372,117.53/1,389.24
  6. Step 6: Final answer
    x = 1,707.49

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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.