Home / 390,573.21-538,983.90-220,807.38

Finding the Fourth Proportional to 390,573.21, 538,983.90 and 220,807.38

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Solution

The fourth proportional to 390,573.21, 538,983.90 and 220,807.38 is: 304,710.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,573.21 : 538,983.90 = 220,807.38 : x
  2. Step 2: Convert to fraction form
    390,573.21/538,983.90 = 220,807.38/x
  3. Step 3: Cross multiply
    390,573.21x = 538,983.90 × 220,807.38
  4. Step 4: Simplify right side
    390,573.21x = 119,011,622,821.18
  5. Step 5: Solve for x
    x = 119,011,622,821.18/390,573.21
  6. Step 6: Final answer
    x = 304,710.15

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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.