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Finding the Fourth Proportional to 859,643.70, 1,289,476.35 and 260,610.90

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Solution

The fourth proportional to 859,643.70, 1,289,476.35 and 260,610.90 is: 390,919.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,643.70 : 1,289,476.35 = 260,610.90 : x
  2. Step 2: Convert to fraction form
    859,643.70/1,289,476.35 = 260,610.90/x
  3. Step 3: Cross multiply
    859,643.70x = 1,289,476.35 × 260,610.90
  4. Step 4: Simplify right side
    859,643.70x = 336,051,592,102.22
  5. Step 5: Solve for x
    x = 336,051,592,102.22/859,643.70
  6. Step 6: Final answer
    x = 390,919.62

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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.