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Finding the Fourth Proportional to 318,585.74, 438,700.59 and 311,514.44

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Solution

The fourth proportional to 318,585.74, 438,700.59 and 311,514.44 is: 428,963.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,585.74 : 438,700.59 = 311,514.44 : x
  2. Step 2: Convert to fraction form
    318,585.74/438,700.59 = 311,514.44/x
  3. Step 3: Cross multiply
    318,585.74x = 438,700.59 × 311,514.44
  4. Step 4: Simplify right side
    318,585.74x = 136,661,566,428.02
  5. Step 5: Solve for x
    x = 136,661,566,428.02/318,585.74
  6. Step 6: Final answer
    x = 428,963.23

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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.