Home / 13,128.02-18,116.86-7,159.68

Finding the Fourth Proportional to 13,128.02, 18,116.86 and 7,159.68

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Solution

The fourth proportional to 13,128.02, 18,116.86 and 7,159.68 is: 9,880.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.02 : 18,116.86 = 7,159.68 : x
  2. Step 2: Convert to fraction form
    13,128.02/18,116.86 = 7,159.68/x
  3. Step 3: Cross multiply
    13,128.02x = 18,116.86 × 7,159.68
  4. Step 4: Simplify right side
    13,128.02x = 129,710,920.20
  5. Step 5: Solve for x
    x = 129,710,920.20/13,128.02
  6. Step 6: Final answer
    x = 9,880.46

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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.