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Finding the Fourth Proportional to 318,630.96, 439,486.74 and 209,700.59

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Solution

The fourth proportional to 318,630.96, 439,486.74 and 209,700.59 is: 289,239.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,630.96 : 439,486.74 = 209,700.59 : x
  2. Step 2: Convert to fraction form
    318,630.96/439,486.74 = 209,700.59/x
  3. Step 3: Cross multiply
    318,630.96x = 439,486.74 × 209,700.59
  4. Step 4: Simplify right side
    318,630.96x = 92,160,626,477.74
  5. Step 5: Solve for x
    x = 92,160,626,477.74/318,630.96
  6. Step 6: Final answer
    x = 289,239.40

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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.