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Finding the Fourth Proportional to 153,607.36, 211,979.76 and 85,630.28

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Solution

The fourth proportional to 153,607.36, 211,979.76 and 85,630.28 is: 118,170.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,607.36 : 211,979.76 = 85,630.28 : x
  2. Step 2: Convert to fraction form
    153,607.36/211,979.76 = 85,630.28/x
  3. Step 3: Cross multiply
    153,607.36x = 211,979.76 × 85,630.28
  4. Step 4: Simplify right side
    153,607.36x = 18,151,885,361.05
  5. Step 5: Solve for x
    x = 18,151,885,361.05/153,607.36
  6. Step 6: Final answer
    x = 118,170.67

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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.