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Finding the Fourth Proportional to 318,889.76, 439,980.32 and 221,985.04

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Solution

The fourth proportional to 318,889.76, 439,980.32 and 221,985.04 is: 306,278.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,889.76 : 439,980.32 = 221,985.04 : x
  2. Step 2: Convert to fraction form
    318,889.76/439,980.32 = 221,985.04/x
  3. Step 3: Cross multiply
    318,889.76x = 439,980.32 × 221,985.04
  4. Step 4: Simplify right side
    318,889.76x = 97,669,048,934.41
  5. Step 5: Solve for x
    x = 97,669,048,934.41/318,889.76
  6. Step 6: Final answer
    x = 306,278.41

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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.