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Finding the Fourth Proportional to 708,356, 977,592.72 and 390,465.44

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Solution

The fourth proportional to 708,356, 977,592.72 and 390,465.44 is: 538,876.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,356 : 977,592.72 = 390,465.44 : x
  2. Step 2: Convert to fraction form
    708,356/977,592.72 = 390,465.44/x
  3. Step 3: Cross multiply
    708,356x = 977,592.72 × 390,465.44
  4. Step 4: Simplify right side
    708,356x = 381,716,171,555.60
  5. Step 5: Solve for x
    x = 381,716,171,555.60/708,356
  6. Step 6: Final answer
    x = 538,876.17

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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.