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Finding the Fourth Proportional to 153,980.64, 212,479.20 and 90,306.72

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Solution

The fourth proportional to 153,980.64, 212,479.20 and 90,306.72 is: 124,615.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,980.64 : 212,479.20 = 90,306.72 : x
  2. Step 2: Convert to fraction form
    153,980.64/212,479.20 = 90,306.72/x
  3. Step 3: Cross multiply
    153,980.64x = 212,479.20 × 90,306.72
  4. Step 4: Simplify right side
    153,980.64x = 19,188,299,620.22
  5. Step 5: Solve for x
    x = 19,188,299,620.22/153,980.64
  6. Step 6: Final answer
    x = 124,615.01

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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.