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Finding the Fourth Proportional to 643,508.18, 888,041.40 and 357,027.58

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Solution

The fourth proportional to 643,508.18, 888,041.40 and 357,027.58 is: 492,698.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,508.18 : 888,041.40 = 357,027.58 : x
  2. Step 2: Convert to fraction form
    643,508.18/888,041.40 = 357,027.58/x
  3. Step 3: Cross multiply
    643,508.18x = 888,041.40 × 357,027.58
  4. Step 4: Simplify right side
    643,508.18x = 317,055,271,981.81
  5. Step 5: Solve for x
    x = 317,055,271,981.81/643,508.18
  6. Step 6: Final answer
    x = 492,698.12

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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.