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Finding the Fourth Proportional to 708,626, 977,903.88 and 390,674

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Solution

The fourth proportional to 708,626, 977,903.88 and 390,674 is: 539,130.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,626 : 977,903.88 = 390,674 : x
  2. Step 2: Convert to fraction form
    708,626/977,903.88 = 390,674/x
  3. Step 3: Cross multiply
    708,626x = 977,903.88 × 390,674
  4. Step 4: Simplify right side
    708,626x = 382,041,620,415.12
  5. Step 5: Solve for x
    x = 382,041,620,415.12/708,626
  6. Step 6: Final answer
    x = 539,130.12

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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.