Home / 390,987.42-539,547.90-221,225.18

Finding the Fourth Proportional to 390,987.42, 539,547.90 and 221,225.18

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Solution

The fourth proportional to 390,987.42, 539,547.90 and 221,225.18 is: 305,282.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,987.42 : 539,547.90 = 221,225.18 : x
  2. Step 2: Convert to fraction form
    390,987.42/539,547.90 = 221,225.18/x
  3. Step 3: Cross multiply
    390,987.42x = 539,547.90 × 221,225.18
  4. Step 4: Simplify right side
    390,987.42x = 119,361,581,296.12
  5. Step 5: Solve for x
    x = 119,361,581,296.12/390,987.42
  6. Step 6: Final answer
    x = 305,282.41

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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.