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Finding the Fourth Proportional to 858,915.90, 1,288,045.80 and 259,677.90

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Solution

The fourth proportional to 858,915.90, 1,288,045.80 and 259,677.90 is: 389,417.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,915.90 : 1,288,045.80 = 259,677.90 : x
  2. Step 2: Convert to fraction form
    858,915.90/1,288,045.80 = 259,677.90/x
  3. Step 3: Cross multiply
    858,915.90x = 1,288,045.80 × 259,677.90
  4. Step 4: Simplify right side
    858,915.90x = 334,477,028,447.82
  5. Step 5: Solve for x
    x = 334,477,028,447.82/858,915.90
  6. Step 6: Final answer
    x = 389,417.67

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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.