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Finding the Fourth Proportional to 153,663.88, 212,058.42 and 85,678.84

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Solution

The fourth proportional to 153,663.88, 212,058.42 and 85,678.84 is: 118,238.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,663.88 : 212,058.42 = 85,678.84 : x
  2. Step 2: Convert to fraction form
    153,663.88/212,058.42 = 85,678.84/x
  3. Step 3: Cross multiply
    153,663.88x = 212,058.42 × 85,678.84
  4. Step 4: Simplify right side
    153,663.88x = 18,168,919,437.83
  5. Step 5: Solve for x
    x = 18,168,919,437.83/153,663.88
  6. Step 6: Final answer
    x = 118,238.06

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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.