Home / 390,944.77-539,500.13-221,178.89

Finding the Fourth Proportional to 390,944.77, 539,500.13 and 221,178.89

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Solution

The fourth proportional to 390,944.77, 539,500.13 and 221,178.89 is: 305,224.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,944.77 : 539,500.13 = 221,178.89 : x
  2. Step 2: Convert to fraction form
    390,944.77/539,500.13 = 221,178.89/x
  3. Step 3: Cross multiply
    390,944.77x = 539,500.13 × 221,178.89
  4. Step 4: Simplify right side
    390,944.77x = 119,326,039,908.26
  5. Step 5: Solve for x
    x = 119,326,039,908.26/390,944.77
  6. Step 6: Final answer
    x = 305,224.80

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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.