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Finding the Fourth Proportional to 402,136.13, 555,163.31 and 310,054.30

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Solution

The fourth proportional to 402,136.13, 555,163.31 and 310,054.30 is: 428,041.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,136.13 : 555,163.31 = 310,054.30 : x
  2. Step 2: Convert to fraction form
    402,136.13/555,163.31 = 310,054.30/x
  3. Step 3: Cross multiply
    402,136.13x = 555,163.31 × 310,054.30
  4. Step 4: Simplify right side
    402,136.13x = 172,130,771,467.73
  5. Step 5: Solve for x
    x = 172,130,771,467.73/402,136.13
  6. Step 6: Final answer
    x = 428,041.05

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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.