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Finding the Fourth Proportional to 317,718.72, 438,208.88 and 215,822.74

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Solution

The fourth proportional to 317,718.72, 438,208.88 and 215,822.74 is: 297,670.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,718.72 : 438,208.88 = 215,822.74 : x
  2. Step 2: Convert to fraction form
    317,718.72/438,208.88 = 215,822.74/x
  3. Step 3: Cross multiply
    317,718.72x = 438,208.88 × 215,822.74
  4. Step 4: Simplify right side
    317,718.72x = 94,575,441,173.93
  5. Step 5: Solve for x
    x = 94,575,441,173.93/317,718.72
  6. Step 6: Final answer
    x = 297,670.35

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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.