Home / 390,574.21-538,985.28-220,808.38

Finding the Fourth Proportional to 390,574.21, 538,985.28 and 220,808.38

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Solution

The fourth proportional to 390,574.21, 538,985.28 and 220,808.38 is: 304,711.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,574.21 : 538,985.28 = 220,808.38 : x
  2. Step 2: Convert to fraction form
    390,574.21/538,985.28 = 220,808.38/x
  3. Step 3: Cross multiply
    390,574.21x = 538,985.28 × 220,808.38
  4. Step 4: Simplify right side
    390,574.21x = 119,012,466,520.65
  5. Step 5: Solve for x
    x = 119,012,466,520.65/390,574.21
  6. Step 6: Final answer
    x = 304,711.53

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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.