Home / 1,038.18-1,429.47-890.22

Finding the Fourth Proportional to 1,038.18, 1,429.47 and 890.22

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Solution

The fourth proportional to 1,038.18, 1,429.47 and 890.22 is: 1,225.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.18 : 1,429.47 = 890.22 : x
  2. Step 2: Convert to fraction form
    1,038.18/1,429.47 = 890.22/x
  3. Step 3: Cross multiply
    1,038.18x = 1,429.47 × 890.22
  4. Step 4: Simplify right side
    1,038.18x = 1,272,542.78
  5. Step 5: Solve for x
    x = 1,272,542.78/1,038.18
  6. Step 6: Final answer
    x = 1,225.74

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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.