Home / 811,784,478.19-1,218,137,353.05-438,287,390.47

Finding the Fourth Proportional to 811,784,478.19, 1,218,137,353.05 and 438,287,390.47

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Solution

The fourth proportional to 811,784,478.19, 1,218,137,353.05 and 438,287,390.47 is: 657,679,785.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,784,478.19 : 1,218,137,353.05 = 438,287,390.47 : x
  2. Step 2: Convert to fraction form
    811,784,478.19/1,218,137,353.05 = 438,287,390.47/x
  3. Step 3: Cross multiply
    811,784,478.19x = 1,218,137,353.05 × 438,287,390.47
  4. Step 4: Simplify right side
    811,784,478.19x = 533,894,241,702,317,632
  5. Step 5: Solve for x
    x = 533,894,241,702,317,632/811,784,478.19
  6. Step 6: Final answer
    x = 657,679,785.76

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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.