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Finding the Fourth Proportional to 526,636.40, 788,642.40 and 421,660.40

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Solution

The fourth proportional to 526,636.40, 788,642.40 and 421,660.40 is: 631,439.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    526,636.40 : 788,642.40 = 421,660.40 : x
  2. Step 2: Convert to fraction form
    526,636.40/788,642.40 = 421,660.40/x
  3. Step 3: Cross multiply
    526,636.40x = 788,642.40 × 421,660.40
  4. Step 4: Simplify right side
    526,636.40x = 332,539,269,840.96
  5. Step 5: Solve for x
    x = 332,539,269,840.96/526,636.40
  6. Step 6: Final answer
    x = 631,439.96

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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.