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Finding the Fourth Proportional to 707,955, 976,977.90 and 390,003

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Solution

The fourth proportional to 707,955, 976,977.90 and 390,003 is: 538,204.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    707,955 : 976,977.90 = 390,003 : x
  2. Step 2: Convert to fraction form
    707,955/976,977.90 = 390,003/x
  3. Step 3: Cross multiply
    707,955x = 976,977.90 × 390,003
  4. Step 4: Simplify right side
    707,955x = 381,024,311,933.70
  5. Step 5: Solve for x
    x = 381,024,311,933.70/707,955
  6. Step 6: Final answer
    x = 538,204.14

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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.