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Finding the Fourth Proportional to 153,963.90, 212,466.03 and 85,978.98

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Solution

The fourth proportional to 153,963.90, 212,466.03 and 85,978.98 is: 118,648.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,963.90 : 212,466.03 = 85,978.98 : x
  2. Step 2: Convert to fraction form
    153,963.90/212,466.03 = 85,978.98/x
  3. Step 3: Cross multiply
    153,963.90x = 212,466.03 × 85,978.98
  4. Step 4: Simplify right side
    153,963.90x = 18,267,612,544.05
  5. Step 5: Solve for x
    x = 18,267,612,544.05/153,963.90
  6. Step 6: Final answer
    x = 118,648.67

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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.