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Finding the Fourth Proportional to 642,000.47, 885,959.84 and 355,520.21

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Solution

The fourth proportional to 642,000.47, 885,959.84 and 355,520.21 is: 490,617.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,000.47 : 885,959.84 = 355,520.21 : x
  2. Step 2: Convert to fraction form
    642,000.47/885,959.84 = 355,520.21/x
  3. Step 3: Cross multiply
    642,000.47x = 885,959.84 × 355,520.21
  4. Step 4: Simplify right side
    642,000.47x = 314,976,628,368.37
  5. Step 5: Solve for x
    x = 314,976,628,368.37/642,000.47
  6. Step 6: Final answer
    x = 490,617.44

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Double scale
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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.