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Finding the Fourth Proportional to 391,030.02, 539,632.80 and 221,260.50

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Solution

The fourth proportional to 391,030.02, 539,632.80 and 221,260.50 is: 305,345.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,030.02 : 539,632.80 = 221,260.50 : x
  2. Step 2: Convert to fraction form
    391,030.02/539,632.80 = 221,260.50/x
  3. Step 3: Cross multiply
    391,030.02x = 539,632.80 × 221,260.50
  4. Step 4: Simplify right side
    391,030.02x = 119,399,423,144.40
  5. Step 5: Solve for x
    x = 119,399,423,144.40/391,030.02
  6. Step 6: Final answer
    x = 305,345.92

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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.