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Finding the Fourth Proportional to 426,547,872.70, 639,821,809.05 and 392,955,552.70

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Solution

The fourth proportional to 426,547,872.70, 639,821,809.05 and 392,955,552.70 is: 589,433,329.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,547,872.70 : 639,821,809.05 = 392,955,552.70 : x
  2. Step 2: Convert to fraction form
    426,547,872.70/639,821,809.05 = 392,955,552.70/x
  3. Step 3: Cross multiply
    426,547,872.70x = 639,821,809.05 × 392,955,552.70
  4. Step 4: Simplify right side
    426,547,872.70x = 251,421,532,604,756,576
  5. Step 5: Solve for x
    x = 251,421,532,604,756,576/426,547,872.70
  6. Step 6: Final answer
    x = 589,433,329.05

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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.