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Finding the Fourth Proportional to 660,314.88, 989,903.88 and 280,888.20

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Solution

The fourth proportional to 660,314.88, 989,903.88 and 280,888.20 is: 421,090.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,314.88 : 989,903.88 = 280,888.20 : x
  2. Step 2: Convert to fraction form
    660,314.88/989,903.88 = 280,888.20/x
  3. Step 3: Cross multiply
    660,314.88x = 989,903.88 × 280,888.20
  4. Step 4: Simplify right side
    660,314.88x = 278,052,319,026.22
  5. Step 5: Solve for x
    x = 278,052,319,026.22/660,314.88
  6. Step 6: Final answer
    x = 421,090.49

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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.