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Finding the Fourth Proportional to 630,674,900.80, 945,368,498.40 and 426,223,643.20

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Solution

The fourth proportional to 630,674,900.80, 945,368,498.40 and 426,223,643.20 is: 638,900,335.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,674,900.80 : 945,368,498.40 = 426,223,643.20 : x
  2. Step 2: Convert to fraction form
    630,674,900.80/945,368,498.40 = 426,223,643.20/x
  3. Step 3: Cross multiply
    630,674,900.80x = 945,368,498.40 × 426,223,643.20
  4. Step 4: Simplify right side
    630,674,900.80x = 402,938,405,554,561,344
  5. Step 5: Solve for x
    x = 402,938,405,554,561,344/630,674,900.80
  6. Step 6: Final answer
    x = 638,900,335.25

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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.