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Finding the Fourth Proportional to 153,999.72, 212,518.98 and 86,931.24

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Solution

The fourth proportional to 153,999.72, 212,518.98 and 86,931.24 is: 119,964.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,999.72 : 212,518.98 = 86,931.24 : x
  2. Step 2: Convert to fraction form
    153,999.72/212,518.98 = 86,931.24/x
  3. Step 3: Cross multiply
    153,999.72x = 212,518.98 × 86,931.24
  4. Step 4: Simplify right side
    153,999.72x = 18,474,538,454.94
  5. Step 5: Solve for x
    x = 18,474,538,454.94/153,999.72
  6. Step 6: Final answer
    x = 119,964.75

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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.