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Finding the Fourth Proportional to 643,888.69, 888,386.32 and 402,416.55

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Solution

The fourth proportional to 643,888.69, 888,386.32 and 402,416.55 is: 555,222.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,888.69 : 888,386.32 = 402,416.55 : x
  2. Step 2: Convert to fraction form
    643,888.69/888,386.32 = 402,416.55/x
  3. Step 3: Cross multiply
    643,888.69x = 888,386.32 × 402,416.55
  4. Step 4: Simplify right side
    643,888.69x = 357,501,357,961.60
  5. Step 5: Solve for x
    x = 357,501,357,961.60/643,888.69
  6. Step 6: Final answer
    x = 555,222.30

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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.