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Finding the Fourth Proportional to 680,964.54, 939,649.30 and 390,561.01

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Solution

The fourth proportional to 680,964.54, 939,649.30 and 390,561.01 is: 538,927.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,964.54 : 939,649.30 = 390,561.01 : x
  2. Step 2: Convert to fraction form
    680,964.54/939,649.30 = 390,561.01/x
  3. Step 3: Cross multiply
    680,964.54x = 939,649.30 × 390,561.01
  4. Step 4: Simplify right side
    680,964.54x = 366,990,381,514.72
  5. Step 5: Solve for x
    x = 366,990,381,514.72/680,964.54
  6. Step 6: Final answer
    x = 538,927.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.