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Finding the Fourth Proportional to 708,281, 977,427.80 and 390,329

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Solution

The fourth proportional to 708,281, 977,427.80 and 390,329 is: 538,654.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,281 : 977,427.80 = 390,329 : x
  2. Step 2: Convert to fraction form
    708,281/977,427.80 = 390,329/x
  3. Step 3: Cross multiply
    708,281x = 977,427.80 × 390,329
  4. Step 4: Simplify right side
    708,281x = 381,518,415,746.20
  5. Step 5: Solve for x
    x = 381,518,415,746.20/708,281
  6. Step 6: Final answer
    x = 538,654.03

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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.