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Finding the Fourth Proportional to 639,240.40, 958,860.60 and 358,721.20

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Solution

The fourth proportional to 639,240.40, 958,860.60 and 358,721.20 is: 538,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,240.40 : 958,860.60 = 358,721.20 : x
  2. Step 2: Convert to fraction form
    639,240.40/958,860.60 = 358,721.20/x
  3. Step 3: Cross multiply
    639,240.40x = 958,860.60 × 358,721.20
  4. Step 4: Simplify right side
    639,240.40x = 343,963,625,064.72
  5. Step 5: Solve for x
    x = 343,963,625,064.72/639,240.40
  6. Step 6: Final answer
    x = 538,081.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.