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Finding the Fourth Proportional to 121,287.40, 181,931.10 and 117,831.40

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Solution

The fourth proportional to 121,287.40, 181,931.10 and 117,831.40 is: 176,747.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,287.40 : 181,931.10 = 117,831.40 : x
  2. Step 2: Convert to fraction form
    121,287.40/181,931.10 = 117,831.40/x
  3. Step 3: Cross multiply
    121,287.40x = 181,931.10 × 117,831.40
  4. Step 4: Simplify right side
    121,287.40x = 21,437,196,216.54
  5. Step 5: Solve for x
    x = 21,437,196,216.54/121,287.40
  6. Step 6: Final answer
    x = 176,747.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.