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Finding the Fourth Proportional to 708,255, 977,391.90 and 390,303

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Solution

The fourth proportional to 708,255, 977,391.90 and 390,303 is: 538,618.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,255 : 977,391.90 = 390,303 : x
  2. Step 2: Convert to fraction form
    708,255/977,391.90 = 390,303/x
  3. Step 3: Cross multiply
    708,255x = 977,391.90 × 390,303
  4. Step 4: Simplify right side
    708,255x = 381,478,990,745.70
  5. Step 5: Solve for x
    x = 381,478,990,745.70/708,255
  6. Step 6: Final answer
    x = 538,618.14

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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.