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Finding the Fourth Proportional to 638,712.76, 881,411.34 and 352,259.32

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Solution

The fourth proportional to 638,712.76, 881,411.34 and 352,259.32 is: 486,111.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,712.76 : 881,411.34 = 352,259.32 : x
  2. Step 2: Convert to fraction form
    638,712.76/881,411.34 = 352,259.32/x
  3. Step 3: Cross multiply
    638,712.76x = 881,411.34 × 352,259.32
  4. Step 4: Simplify right side
    638,712.76x = 310,485,359,268.69
  5. Step 5: Solve for x
    x = 310,485,359,268.69/638,712.76
  6. Step 6: Final answer
    x = 486,111.10

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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.