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Finding the Fourth Proportional to 708,682.72, 977,989.80 and 386,390.20

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Solution

The fourth proportional to 708,682.72, 977,989.80 and 386,390.20 is: 533,222.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,682.72 : 977,989.80 = 386,390.20 : x
  2. Step 2: Convert to fraction form
    708,682.72/977,989.80 = 386,390.20/x
  3. Step 3: Cross multiply
    708,682.72x = 977,989.80 × 386,390.20
  4. Step 4: Simplify right side
    708,682.72x = 377,885,674,419.96
  5. Step 5: Solve for x
    x = 377,885,674,419.96/708,682.72
  6. Step 6: Final answer
    x = 533,222.64

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1.5x scale

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.