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Finding the Fourth Proportional to 153,670, 212,064.60 and 86,604.40

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Solution

The fourth proportional to 153,670, 212,064.60 and 86,604.40 is: 119,514.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,670 : 212,064.60 = 86,604.40 : x
  2. Step 2: Convert to fraction form
    153,670/212,064.60 = 86,604.40/x
  3. Step 3: Cross multiply
    153,670x = 212,064.60 × 86,604.40
  4. Step 4: Simplify right side
    153,670x = 18,365,727,444.24
  5. Step 5: Solve for x
    x = 18,365,727,444.24/153,670
  6. Step 6: Final answer
    x = 119,514.07

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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.