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Finding the Fourth Proportional to 709,867.52, 979,638.80 and 403,987.89

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Solution

The fourth proportional to 709,867.52, 979,638.80 and 403,987.89 is: 557,515.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,867.52 : 979,638.80 = 403,987.89 : x
  2. Step 2: Convert to fraction form
    709,867.52/979,638.80 = 403,987.89/x
  3. Step 3: Cross multiply
    709,867.52x = 979,638.80 × 403,987.89
  4. Step 4: Simplify right side
    709,867.52x = 395,762,211,774.13
  5. Step 5: Solve for x
    x = 395,762,211,774.13/709,867.52
  6. Step 6: Final answer
    x = 557,515.59

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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.