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Finding the Fourth Proportional to 298,987.08, 448,590 and 139,139.28

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Solution

The fourth proportional to 298,987.08, 448,590 and 139,139.28 is: 208,759.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    298,987.08 : 448,590 = 139,139.28 : x
  2. Step 2: Convert to fraction form
    298,987.08/448,590 = 139,139.28/x
  3. Step 3: Cross multiply
    298,987.08x = 448,590 × 139,139.28
  4. Step 4: Simplify right side
    298,987.08x = 62,416,489,615.20
  5. Step 5: Solve for x
    x = 62,416,489,615.20/298,987.08
  6. Step 6: Final answer
    x = 208,759.82

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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.