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Finding the Fourth Proportional to 390,810.38, 539,318.32 and 221,040.86

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Solution

The fourth proportional to 390,810.38, 539,318.32 and 221,040.86 is: 305,036.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,810.38 : 539,318.32 = 221,040.86 : x
  2. Step 2: Convert to fraction form
    390,810.38/539,318.32 = 221,040.86/x
  3. Step 3: Cross multiply
    390,810.38x = 539,318.32 × 221,040.86
  4. Step 4: Simplify right side
    390,810.38x = 119,211,382,017.36
  5. Step 5: Solve for x
    x = 119,211,382,017.36/390,810.38
  6. Step 6: Final answer
    x = 305,036.38

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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.