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Finding the Fourth Proportional to 717,330,782.09, 989,885,893.84 and 399,774,130.20

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Solution

The fourth proportional to 717,330,782.09, 989,885,893.84 and 399,774,130.20 is: 551,671,254.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,330,782.09 : 989,885,893.84 = 399,774,130.20 : x
  2. Step 2: Convert to fraction form
    717,330,782.09/989,885,893.84 = 399,774,130.20/x
  3. Step 3: Cross multiply
    717,330,782.09x = 989,885,893.84 × 399,774,130.20
  4. Step 4: Simplify right side
    717,330,782.09x = 395,730,772,206,128,064
  5. Step 5: Solve for x
    x = 395,730,772,206,128,064/717,330,782.09
  6. Step 6: Final answer
    x = 551,671,254.16

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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.