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Finding the Fourth Proportional to 390,074.40, 538,309.80 and 220,276.80

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Solution

The fourth proportional to 390,074.40, 538,309.80 and 220,276.80 is: 303,986.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,074.40 : 538,309.80 = 220,276.80 : x
  2. Step 2: Convert to fraction form
    390,074.40/538,309.80 = 220,276.80/x
  3. Step 3: Cross multiply
    390,074.40x = 538,309.80 × 220,276.80
  4. Step 4: Simplify right side
    390,074.40x = 118,577,160,152.64
  5. Step 5: Solve for x
    x = 118,577,160,152.64/390,074.40
  6. Step 6: Final answer
    x = 303,986.01

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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.