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Finding the Fourth Proportional to 426,326.40, 639,489.60 and 299,145.60

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Solution

The fourth proportional to 426,326.40, 639,489.60 and 299,145.60 is: 448,718.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,326.40 : 639,489.60 = 299,145.60 : x
  2. Step 2: Convert to fraction form
    426,326.40/639,489.60 = 299,145.60/x
  3. Step 3: Cross multiply
    426,326.40x = 639,489.60 × 299,145.60
  4. Step 4: Simplify right side
    426,326.40x = 191,300,500,085.76
  5. Step 5: Solve for x
    x = 191,300,500,085.76/426,326.40
  6. Step 6: Final answer
    x = 448,718.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.