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Finding the Fourth Proportional to 259,643.60, 389,465.40 and 147,280.40

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Solution

The fourth proportional to 259,643.60, 389,465.40 and 147,280.40 is: 220,920.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,643.60 : 389,465.40 = 147,280.40 : x
  2. Step 2: Convert to fraction form
    259,643.60/389,465.40 = 147,280.40/x
  3. Step 3: Cross multiply
    259,643.60x = 389,465.40 × 147,280.40
  4. Step 4: Simplify right side
    259,643.60x = 57,360,619,898.16
  5. Step 5: Solve for x
    x = 57,360,619,898.16/259,643.60
  6. Step 6: Final answer
    x = 220,920.60

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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.