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Finding the Fourth Proportional to 491,570.40, 690,064.80 and 491,570.40

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Solution

The fourth proportional to 491,570.40, 690,064.80 and 491,570.40 is: 690,064.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,570.40 : 690,064.80 = 491,570.40 : x
  2. Step 2: Convert to fraction form
    491,570.40/690,064.80 = 491,570.40/x
  3. Step 3: Cross multiply
    491,570.40x = 690,064.80 × 491,570.40
  4. Step 4: Simplify right side
    491,570.40x = 339,215,429,761.92
  5. Step 5: Solve for x
    x = 339,215,429,761.92/491,570.40
  6. Step 6: Final answer
    x = 690,064.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.