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Finding the Fourth Proportional to 708,416.86, 977,570.87 and 390,464.86

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Solution

The fourth proportional to 708,416.86, 977,570.87 and 390,464.86 is: 538,817.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,416.86 : 977,570.87 = 390,464.86 : x
  2. Step 2: Convert to fraction form
    708,416.86/977,570.87 = 390,464.86/x
  3. Step 3: Cross multiply
    708,416.86x = 977,570.87 × 390,464.86
  4. Step 4: Simplify right side
    708,416.86x = 381,707,072,894.63
  5. Step 5: Solve for x
    x = 381,707,072,894.63/708,416.86
  6. Step 6: Final answer
    x = 538,817.04

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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.