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Finding the Fourth Proportional to 153,871.70, 212,378.37 and 90,230.00

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Solution

The fourth proportional to 153,871.70, 212,378.37 and 90,230.00 is: 124,538.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,871.70 : 212,378.37 = 90,230.00 : x
  2. Step 2: Convert to fraction form
    153,871.70/212,378.37 = 90,230.00/x
  3. Step 3: Cross multiply
    153,871.70x = 212,378.37 × 90,230.00
  4. Step 4: Simplify right side
    153,871.70x = 19,162,900,880.79
  5. Step 5: Solve for x
    x = 19,162,900,880.79/153,871.70
  6. Step 6: Final answer
    x = 124,538.18

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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.