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Finding the Fourth Proportional to 402,690.80, 555,714.30 and 221,421.20

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Solution

The fourth proportional to 402,690.80, 555,714.30 and 221,421.20 is: 305,561.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,690.80 : 555,714.30 = 221,421.20 : x
  2. Step 2: Convert to fraction form
    402,690.80/555,714.30 = 221,421.20/x
  3. Step 3: Cross multiply
    402,690.80x = 555,714.30 × 221,421.20
  4. Step 4: Simplify right side
    402,690.80x = 123,046,927,163.16
  5. Step 5: Solve for x
    x = 123,046,927,163.16/402,690.80
  6. Step 6: Final answer
    x = 305,561.80

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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.