Home / 1,440.09-1,986.66-915.75

Finding the Fourth Proportional to 1,440.09, 1,986.66 and 915.75

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Solution

The fourth proportional to 1,440.09, 1,986.66 and 915.75 is: 1,263.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.09 : 1,986.66 = 915.75 : x
  2. Step 2: Convert to fraction form
    1,440.09/1,986.66 = 915.75/x
  3. Step 3: Cross multiply
    1,440.09x = 1,986.66 × 915.75
  4. Step 4: Simplify right side
    1,440.09x = 1,819,283.90
  5. Step 5: Solve for x
    x = 1,819,283.90/1,440.09
  6. Step 6: Final answer
    x = 1,263.31

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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.