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Finding the Fourth Proportional to 390,003.90, 538,455.51 and 318,555.42

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Solution

The fourth proportional to 390,003.90, 538,455.51 and 318,555.42 is: 439,810.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,003.90 : 538,455.51 = 318,555.42 : x
  2. Step 2: Convert to fraction form
    390,003.90/538,455.51 = 318,555.42/x
  3. Step 3: Cross multiply
    390,003.90x = 538,455.51 × 318,555.42
  4. Step 4: Simplify right side
    390,003.90x = 171,527,921,139.36
  5. Step 5: Solve for x
    x = 171,527,921,139.36/390,003.90
  6. Step 6: Final answer
    x = 439,810.78

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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.