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Finding the Fourth Proportional to 643,690.90, 888,263.50 and 357,208.48

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Solution

The fourth proportional to 643,690.90, 888,263.50 and 357,208.48 is: 492,931.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,690.90 : 888,263.50 = 357,208.48 : x
  2. Step 2: Convert to fraction form
    643,690.90/888,263.50 = 357,208.48/x
  3. Step 3: Cross multiply
    643,690.90x = 888,263.50 × 357,208.48
  4. Step 4: Simplify right side
    643,690.90x = 317,295,248,447.12
  5. Step 5: Solve for x
    x = 317,295,248,447.12/643,690.90
  6. Step 6: Final answer
    x = 492,931.08

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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.