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Finding the Fourth Proportional to 660,065.70, 989,904.15 and 260,573.70

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Solution

The fourth proportional to 660,065.70, 989,904.15 and 260,573.70 is: 390,783.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,065.70 : 989,904.15 = 260,573.70 : x
  2. Step 2: Convert to fraction form
    660,065.70/989,904.15 = 260,573.70/x
  3. Step 3: Cross multiply
    660,065.70x = 989,904.15 × 260,573.70
  4. Step 4: Simplify right side
    660,065.70x = 257,942,987,010.86
  5. Step 5: Solve for x
    x = 257,942,987,010.86/660,065.70
  6. Step 6: Final answer
    x = 390,783.81

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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.