Home / 390,006.40-538,458.96-318,557.92

Finding the Fourth Proportional to 390,006.40, 538,458.96 and 318,557.92

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Solution

The fourth proportional to 390,006.40, 538,458.96 and 318,557.92 is: 439,814.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,006.40 : 538,458.96 = 318,557.92 : x
  2. Step 2: Convert to fraction form
    390,006.40/538,458.96 = 318,557.92/x
  3. Step 3: Cross multiply
    390,006.40x = 538,458.96 × 318,557.92
  4. Step 4: Simplify right side
    390,006.40x = 171,530,366,302.96
  5. Step 5: Solve for x
    x = 171,530,366,302.96/390,006.40
  6. Step 6: Final answer
    x = 439,814.23

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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.