Home / 1,030.49-1,421.28-715.75

Finding the Fourth Proportional to 1,030.49, 1,421.28 and 715.75

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Solution

The fourth proportional to 1,030.49, 1,421.28 and 715.75 is: 987.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.49 : 1,421.28 = 715.75 : x
  2. Step 2: Convert to fraction form
    1,030.49/1,421.28 = 715.75/x
  3. Step 3: Cross multiply
    1,030.49x = 1,421.28 × 715.75
  4. Step 4: Simplify right side
    1,030.49x = 1,017,277.61
  5. Step 5: Solve for x
    x = 1,017,277.61/1,030.49
  6. Step 6: Final answer
    x = 987.18

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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.