Home / 121,831.04-168,128-71,530.88

Finding the Fourth Proportional to 121,831.04, 168,128 and 71,530.88

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Solution

The fourth proportional to 121,831.04, 168,128 and 71,530.88 is: 98,713.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,831.04 : 168,128 = 71,530.88 : x
  2. Step 2: Convert to fraction form
    121,831.04/168,128 = 71,530.88/x
  3. Step 3: Cross multiply
    121,831.04x = 168,128 × 71,530.88
  4. Step 4: Simplify right side
    121,831.04x = 12,026,343,792.64
  5. Step 5: Solve for x
    x = 12,026,343,792.64/121,831.04
  6. Step 6: Final answer
    x = 98,713.30

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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.