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Finding the Fourth Proportional to 640,143.35, 883,387.50 and 349,748.67

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Solution

The fourth proportional to 640,143.35, 883,387.50 and 349,748.67 is: 482,647.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,143.35 : 883,387.50 = 349,748.67 : x
  2. Step 2: Convert to fraction form
    640,143.35/883,387.50 = 349,748.67/x
  3. Step 3: Cross multiply
    640,143.35x = 883,387.50 × 349,748.67
  4. Step 4: Simplify right side
    640,143.35x = 308,963,603,219.63
  5. Step 5: Solve for x
    x = 308,963,603,219.63/640,143.35
  6. Step 6: Final answer
    x = 482,647.53

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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.