Home / 390,782.58-539,381.34-221,115.12

Finding the Fourth Proportional to 390,782.58, 539,381.34 and 221,115.12

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Solution

The fourth proportional to 390,782.58, 539,381.34 and 221,115.12 is: 305,196.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,782.58 : 539,381.34 = 221,115.12 : x
  2. Step 2: Convert to fraction form
    390,782.58/539,381.34 = 221,115.12/x
  3. Step 3: Cross multiply
    390,782.58x = 539,381.34 × 221,115.12
  4. Step 4: Simplify right side
    390,782.58x = 119,265,369,719.86
  5. Step 5: Solve for x
    x = 119,265,369,719.86/390,782.58
  6. Step 6: Final answer
    x = 305,196.23

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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.