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Finding the Fourth Proportional to 639,268.80, 958,903.20 and 402,878.40

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Solution

The fourth proportional to 639,268.80, 958,903.20 and 402,878.40 is: 604,317.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,268.80 : 958,903.20 = 402,878.40 : x
  2. Step 2: Convert to fraction form
    639,268.80/958,903.20 = 402,878.40/x
  3. Step 3: Cross multiply
    639,268.80x = 958,903.20 × 402,878.40
  4. Step 4: Simplify right side
    639,268.80x = 386,321,386,970.88
  5. Step 5: Solve for x
    x = 386,321,386,970.88/639,268.80
  6. Step 6: Final answer
    x = 604,317.60

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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.