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Finding the Fourth Proportional to 231,870.40, 347,805.60 and 212,430.40

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Solution

The fourth proportional to 231,870.40, 347,805.60 and 212,430.40 is: 318,645.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,870.40 : 347,805.60 = 212,430.40 : x
  2. Step 2: Convert to fraction form
    231,870.40/347,805.60 = 212,430.40/x
  3. Step 3: Cross multiply
    231,870.40x = 347,805.60 × 212,430.40
  4. Step 4: Simplify right side
    231,870.40x = 73,884,482,730.24
  5. Step 5: Solve for x
    x = 73,884,482,730.24/231,870.40
  6. Step 6: Final answer
    x = 318,645.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.