Home / 390,288.18-538,590.69-220,518.66

Finding the Fourth Proportional to 390,288.18, 538,590.69 and 220,518.66

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Solution

The fourth proportional to 390,288.18, 538,590.69 and 220,518.66 is: 304,311.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,288.18 : 538,590.69 = 220,518.66 : x
  2. Step 2: Convert to fraction form
    390,288.18/538,590.69 = 220,518.66/x
  3. Step 3: Cross multiply
    390,288.18x = 538,590.69 × 220,518.66
  4. Step 4: Simplify right side
    390,288.18x = 118,769,297,247.28
  5. Step 5: Solve for x
    x = 118,769,297,247.28/390,288.18
  6. Step 6: Final answer
    x = 304,311.80

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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.