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Finding the Fourth Proportional to 1,315,649.89, 1,815,649.01 and 742,709.89

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Solution

The fourth proportional to 1,315,649.89, 1,815,649.01 and 742,709.89 is: 1,024,969.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315,649.89 : 1,815,649.01 = 742,709.89 : x
  2. Step 2: Convert to fraction form
    1,315,649.89/1,815,649.01 = 742,709.89/x
  3. Step 3: Cross multiply
    1,315,649.89x = 1,815,649.01 × 742,709.89
  4. Step 4: Simplify right side
    1,315,649.89x = 1,348,500,476,495.71
  5. Step 5: Solve for x
    x = 1,348,500,476,495.71/1,315,649.89
  6. Step 6: Final answer
    x = 1,024,969.09

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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.