Home / 1,915.12-2,642.54-1,129.32

Finding the Fourth Proportional to 1,915.12, 2,642.54 and 1,129.32

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Solution

The fourth proportional to 1,915.12, 2,642.54 and 1,129.32 is: 1,558.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.12 : 2,642.54 = 1,129.32 : x
  2. Step 2: Convert to fraction form
    1,915.12/2,642.54 = 1,129.32/x
  3. Step 3: Cross multiply
    1,915.12x = 2,642.54 × 1,129.32
  4. Step 4: Simplify right side
    1,915.12x = 2,984,276.10
  5. Step 5: Solve for x
    x = 2,984,276.10/1,915.12
  6. Step 6: Final answer
    x = 1,558.27

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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.